ramips: 6.1: dai_dma: drop dma_data->slave_id in mt7620 support patch

Upstream dropped slave_id in dai_dma [0]. So drop it also in the mt7620
support patch.

Fixes errors in the form of:
   sound/soc/ralink/ralink-i2s.c: In function 'ralink_i2s_init_dma_data':
  sound/soc/ralink/ralink-i2s.c:452:17: error: 'struct snd_dmaengine_dai_dma_data' has no member named 'slave_id'
    452 |         dma_data->slave_id = i2s->txdma_req;
        |                 ^~
  sound/soc/ralink/ralink-i2s.c:462:17: error: 'struct snd_dmaengine_dai_dma_data' has no member named 'slave_id'
    462 |         dma_data->slave_id = i2s->rxdma_req;
        |                 ^~

[0] - https://lore.kernel.org/r/[email protected]

Signed-off-by: Nick Hainke <[email protected]>

target/linux/ramips/patches-6.1/835-asoc-add-mt7620-support.patch

@@ -60,7 +60,7 @@ Signed-off-by: John Crispin <[email protected]>
 +obj-$(CONFIG_SND_RALINK_SOC_I2S) += snd-soc-ralink-i2s.o
 --- /dev/null
 +++ b/sound/soc/ralink/ralink-i2s.c
-@@ -0,0 +1,970 @@
+@@ -0,0 +1,968 @@
 +/*
 + *  Copyright (C) 2010, Lars-Peter Clausen <[email protected]>
 + *  Copyright (C) 2016 Michael Lee <[email protected]>
@@ -512,7 +512,6 @@ Signed-off-by: John Crispin <[email protected]>
 +	dma_data->addr = res->start + I2S_REG_WREG;
 +	dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 +	dma_data->maxburst = 1;
-+	dma_data->slave_id = i2s->txdma_req;
 +
 +	if (i2s->flags & RALINK_FLAGS_TXONLY)
 +		return;
@@ -522,7 +521,6 @@ Signed-off-by: John Crispin <[email protected]>
 +	dma_data->addr = res->start + I2S_REG_RREG;
 +	dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 +	dma_data->maxburst = 1;
-+	dma_data->slave_id = i2s->rxdma_req;
 +}
 +
 +static int ralink_i2s_dai_probe(struct snd_soc_dai *dai)